Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 32,208		$ 30,699
Cost of Sales	(30,288)		(29,138)
Gross Profit	1,920		1,561
Operating Expenses	(1,258)		(1,050)
Litigation Charges	(15)		(16)
Gain on Business Combination	0		81
Total Operating Expenses	(1,273)		(985)
Operating Income	647		576
Other Income, Net	6		8
Interest Expense	(59)		(56)
Income from Continuing Operations Before Income Taxes	594		528
Income Tax Expense	(174)		(149)
Income from Continuing Operations	420		379
Income from Discontinued Operations, Net of Tax	4		1
Net Income	$ 424		$ 380
Diluted
Continuing operations	$ 1.81	[1]	$ 1.58	[1]
Discontinued operations	$ 0.02	[1]	$ 0.00	[1]
Total	$ 1.83	[1]	$ 1.58	[1]
Basic
Continuing operations	$ 1.84	[1]	$ 1.61	[1]
Discontinued operations	$ 0.02	[1]	$ 0.00	[1]
Total	$ 1.86	[1]	$ 1.61	[1]
Dividends Declared Per Common Share	$ 0.20		$ 0.20
Weighted Average Common Shares
Diluted	232		240
Basic	227		236

[1] Certain computations may reflect rounding adjustments.